Strange electrical problem? (2010 GTS SUPER)
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Molto Verboso
2010 GTS 300 SUPER
Joined: 02 Nov 2005
Posts: 1522
Location: Belgium
Sun Feb 21, 2021 8:11 am quote
I have a strange electrical problem.

During the winter months i used a Optimate 4 battery charger to keep my battery up to date. (battery bought in 09/2020)

The Vespa started immediately and i drove a short while to the local gas station to check the tire pressure. After that she did not start again.

After recharging the battery the vespa starts perfectly but the engine cuts out when the fan comes on.

Also when i cut the engine i can not start again. The engine turns over strongly.

I have a voltmeter installed that reads +-12,3 V when i start and rises to +- 14 V when driving.

So i seems the alternator works but the electricity doen not reach the battery.

Does this has something to do with the regulator??

Thanks in advance,
Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 39336
Location: Pleasant Hill, CA
Sun Feb 21, 2021 9:10 am quote
To check, ensure the voltmeter is attached directly to the battery.

The battery should read 12.6V (or slightly more) when fully charged, and allowed to rest for an hour or so.

I've had a battery prove dead after being left on an Optimate 4 for some months. So don't believe all the advertising...
Molto Verboso
2010 GTS 300 SUPER
Joined: 02 Nov 2005
Posts: 1522
Location: Belgium
Fri Feb 26, 2021 12:18 am quote
So far i checked this :

*Battery recharge circuit fuse (30A) is OK.

*Battery voltage = 13 V

*Battery voltage with engine running = 14.1 V
Bucheli verlag's manual states that if this value is within the norm, the alternator and regulator are working properly.

*Leakage test (Garmin GPS mount & USB hub disconnected) = 0.09mA

*Leakage test with Garmin GPS mount & USB hub connected = 14.3mA
Manuals state that the maximum current leakage may be 0.5mA

*USB hub uses 14.1mA (no devices connected) ->culprit? normal?

*Garmin cradle uses 0.25mA. (No gps installed)
Veni, Vidi, Posti
In garage: Yamaha Tricity 155 Urban 2019 - MV Agusta 125 RS 1956
Joined: 21 Jul 2007
Posts: 5053
Location: Latina (Italy)
Fri Feb 26, 2021 12:39 am quote
Could it be a failed relay?
Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 39336
Location: Pleasant Hill, CA
Fri Feb 26, 2021 8:52 am quote
Progetto 300 wrote:
*USB hub uses 14.1mA (no devices connected) ->culprit? normal?

Unless it's a specially designed deep-discharge battery, a 12Ah battery only has about 6Ah of usable current draw before it sustains long-term damage.

6/0.014 = 428 hrs. This is ~18 days.

So if the battery went more than about three weeks between doses of Optimate recharging, it has either got at least one shorted cell or its capacity has been otherwise drastically reduced, with bad sulphation. Now I know the Optimate 4 is meant to 'cure' sulphation - it has a good attempt, but this usually only gets the cells equalised, and it cannot cure bad sulphation - that is impossible.

Get the battery both load and capacity tested. I bet it's toast. New ones are cheap enough anyway.
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